1–10
Chapter 1: Cyclone III Device Datasheet
Electrical Characteristics
Schmitt Trigger Input
Cyclone III devices support Schmitt trigger input on TDI, TMS, TCK, nSTATUS, nCONFIG,
nCE
,
CONF_DONE, and DCLK pins. A Schmitt trigger feature introduces hysteresis to the
input signal for improved noise immunity, especially for signal with slow edge rate.
Table 1–12 lists the hysteresis specifications across supported VCCIO range for Schmitt
trigger inputs in Cyclone III devices.
Table 1–12. Hysteresis Specifications for Schmitt Trigger Input in Cyclone III Devices
Symbol
Parameter
Conditions
Minimum
200
Typical
—
Maximum
Unit
mV
mV
mV
mV
VCCIO = 3.3 V
—
—
—
—
V
V
CCIO = 2.5 V
CCIO = 1.8 V
200
—
Hysteresis for Schmitt trigger
input
VSCHMITT
140
—
VCCIO = 1.5 V
110
—
I/O Standard Specifications
The following tables list input voltage sensitivities (VIH and VIL), output voltage (VOH
and VOL), and current drive characteristics (IOH and IOL) for various I/O standards
supported by Cyclone III devices. Table 1–13 through Table 1–18 provide the I/O
standard specifications for Cyclone III devices.
(1), (2)
Table 1–13. Cyclone III Devices Single-Ended I/O Standard Specifications
VCCIO (V)
VIL (V)
VIH (V)
Max
VOL (V)
VOH (V)
IOL
IOH
I/O Standard
(mA)
(mA)
Min
3.135
3.135
2.85
Typ
3.3
3.3
3.0
3.0
Max
3.465
3.465
Min
Max
0.8
0.8
0.8
0.8
Min
1.7
1.7
1.7
1.7
Max
0.45
0.2
Min
2.4
(3)
3.3-V LVTTL
—
—
3.6
4
2
–4
–2
(3)
(3)
3.3-V LVCMOS
3.6
VCCIO – 0.2
2.4
(3)
3.0-V LVTTL
3.15 –0.3
3.15 –0.3
VCCIO + 0.3
VCCIO + 0.3
0.45
0.2
4
–4
3.0-V LVCMOS
2.85
VCCIO – 0.2
0.1
–0.1
2.5-V LVTTL and
LVCMOS
2.375
1.71
1.425
1.14
2.85
2.85
2.5
1.8
1.5
1.2
3.0
3.0
2.625 –0.3
1.89 –0.3
1.575 –0.3
1.26 –0.3
0.7
1.7
3.6
0.4
2.0
1
2
–1
–2
(3)
1.8-V LVTTL and
LVCMOS
0.35 * 0.65 *
VCCIO VCCIO
VCCIO
0.45
–
2.25
0.45
0.35 * 0.65 *
VCCIO VCCIO
0.25 *
VCCIO
0.75 *
VCCIO
1.5-V LVCMOS
1.2-V LVCMOS
3.0-V PCI
VCCIO + 0.3
VCCIO + 0.3
2
–2
0.35 * 0.65 *
VCCIO
0.25 *
VCCIO
0.75 *
VCCIO
2
–2
VCCIO
0.3 *
VCCIO
0.5 *
VCCIO
3.15
3.15
—
—
VCCIO + 0.3 0.1 * VCCIO 0.9 * VCCIO
VCCIO + 0.3 0.1 * VCCIO 0.9 * VCCIO
1.5
1.5
–0.5
–0.5
0.35*
VCCIO
0.5 *
VCCIO
3.0-V PCI-X
Notes to Table 1–13:
(1) For voltage referenced receiver input waveform and explanation of terms used in Table 1–13, refer to “Single-ended Voltage referenced I/O Standard”
in “Glossary” on page 1–27.
(2) AC load CL = 10 pF.
(3) For more detail about interfacing Cyclone III devices with 3.3/3.0/2.5-V LVTTL/LVCMOS I/O standards, refer to AN 447: Interfacing Cyclone III
Devices with 3.3/3.0/2.5-V LVTTL and LVCMOS I/O Systems.
Cyclone III Device Handbook
Volume 2
July 2012 Altera Corporation
ALTERA [ ALTERA CORPORATION ]
